/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.engine.compaction.utils;

import org.apache.commons.io.FileUtils;
import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.engine.cache.BloomFilterCache;
import org.apache.iotdb.db.engine.cache.ChunkCache;
import org.apache.iotdb.db.engine.cache.TimeSeriesMetadataCache;
import org.apache.iotdb.db.engine.compaction.log.CompactionLogger;
import org.apache.iotdb.db.engine.modification.ModificationFile;
import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
import org.apache.iotdb.db.query.control.FileReaderManager;
import org.apache.iotdb.tsfile.common.constant.TsFileConstant;
import org.apache.iotdb.tsfile.fileSystem.FSFactoryProducer;

import java.io.File;
import java.io.IOException;

public class CompactionClearUtils {

    /**
     * Clear all generated and merged files in the test directory
     */
    public static void clearAllCompactionFiles() throws IOException {
        FileReaderManager.getInstance().closeAndRemoveAllOpenedReaders();
        deleteAllFilesInOneDirBySuffix("target", TsFileConstant.TSFILE_SUFFIX);
        deleteAllFilesInOneDirBySuffix("target", TsFileResource.RESOURCE_SUFFIX);
        deleteAllFilesInOneDirBySuffix("target", ModificationFile.FILE_SUFFIX);
        deleteAllFilesInOneDirBySuffix("target", IoTDBConstant.INNER_COMPACTION_TMP_FILE_SUFFIX);
        deleteAllFilesInOneDirBySuffix("target", IoTDBConstant.CROSS_COMPACTION_TMP_FILE_SUFFIX);
        deleteAllFilesInOneDirBySuffix("target", CompactionLogger.INNER_COMPACTION_LOG_NAME_SUFFIX);
        deleteAllFilesInOneDirBySuffix("target", CompactionLogger.CROSS_COMPACTION_LOG_NAME_SUFFIX);
        // clean cache
        if (IoTDBDescriptor.getInstance().getConfig().isMetaDataCacheEnable()) {
            ChunkCache.getInstance().clear();
            TimeSeriesMetadataCache.getInstance().clear();
            BloomFilterCache.getInstance().clear();
        }
        FileReaderManager.getInstance().closeAndRemoveAllOpenedReaders();
    }

    private static void deleteAllFilesInOneDirBySuffix(String dirPath, String suffix)
            throws IOException {
        File dir = new File(dirPath);
        if (!dir.isDirectory()) {
            return;
        }
        if (!dir.exists()) {
            return;
        }
        for (File f : FSFactoryProducer.getFSFactory().listFilesBySuffix(dirPath, suffix)) {
            FileUtils.delete(f);
        }
        File[] tmpFiles = dir.listFiles();
        if (tmpFiles != null) {
            for (File f : tmpFiles) {
                if (f.isDirectory()) {
                    deleteAllFilesInOneDirBySuffix(f.getAbsolutePath(), suffix);
                }
            }
        }
    }

    public static void deleteEmptyDir(File dir) {
        if (!dir.isDirectory()) {
            return;
        }
        for (File f : dir.listFiles()) {
            deleteEmptyDir(f);
        }
        dir.delete();
    }
}
